Removed Element return type

Now the __only__ return type is `HTMLElement`, which should solve the Travis build/test failure.

jquery/jquery.d.ts

@@ -2782,7 +2782,7 @@ interface JQuery {
      * Retrieve all the elements contained in the jQuery set, as an array.
      * @name toArray
      */
-    toArray(): (Element|HTMLElement)[];
+    toArray(): HTMLElement[];
 
     /**
      * Remove the parents of the set of matched elements from the DOM, leaving the matched elements in their place.
@@ -2840,7 +2840,7 @@ interface JQuery {
      * Retrieve the elements matched by the jQuery object.
      * @alias toArray
      */
-    get(): (Element|HTMLElement)[];
+    get(): HTMLElement[];
 
     /**
      * Search for a given element from among the matched elements.